/**
 * MIT License
 * Copyright (c) 2018 yadong.zhang
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.zyd.shiro.util;

import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;

/**
 * @project: springboot-shiro
 * @description: 获取IP的工具类
 * @date: 2019-08-15 10:55 AM
 * @version: 1.0
 * @website: https://yubuntu0109.github.io/
 */
public class IpUtil {

    /**
     * @description: 获取真实的IP地址
     * @param: request
     * @date: 2019-08-15 10:52 AM
     * @return: java.lang.String
     */
    public static String getRealIp(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        return checkIp(ip) ? ip : (
                checkIp(ip = request.getHeader("Proxy-Client-IP")) ? ip : (
                        checkIp(ip = request.getHeader("WL-Proxy-Client-IP")) ? ip :
                                request.getRemoteAddr()));
    }

    /**
     * @description: 校验IP地址
     * @param: ip
     * @date: 2019-08-15 10:53 AM
     * @return: boolean
     */
    private static boolean checkIp(String ip) {
        return !StringUtils.isEmpty(ip) && !"unknown".equalsIgnoreCase(ip);
    }
}